h2 {
    text-align: center;
    font-weight: 400;
}
.xiahuaxian {
    text-decoration: none;
}
.gray {
    color: gray;
    font-size: 12px;
    text-align: center;
}
body{
    font-size: 16px;
    text-indent: 2em;
    line-height: 26px;
}
.search {
    color: #666;
    width: 170px;
}
.btn {
    font-weight: 700;
}
.pic {
    text-align: center;
}